Ship having a plow stem



May 12, 1970 BuYscOLL.

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SHIP HAVING A PLOW STEM Filed May 5, 1969 5 Sheets-Sheei'I /f l Sza 3/ I N VE N TOR. vaag/eras uns'co rroQ/V-ys May 12, 197@ l.. BuYscoLL 3,511,203

SHIP HAVING A PLOW STEM @V/7 A M k) A u EL RJ 7 U INVENTOR.

05559 r0.5' wfsco L BY a aw@ W Afro/@v5 Ys FIGA United States Patent O M' May 24, 1968. This application May 5, 1969, Ser. No. 821,786 l Int. Cl. B63b 1/06 U.S. Cl. 114-56 1 Claim ABSTRACT OF THE DISCLOSURE This application relates to an improved ship stern design for moving water from the path of a ship. The ship includes a hull having a stem formed between its half loaded waterline and its full loaded waterline with a plow having an upwardly and rearwardly projecting taper whereby water at the front of the forwardly moving ship will be raised upwardly as it passes rearwardly over the tapered portions to be divided into approximately equal portions that are directed to opposite sides of said hull.

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation-in-part of application of Ser. No. 732,500, led May 24, 1968.

BACKGROUND OF THE INVENTION Field of the invention The present invention relates generally to ship hulls and, more particularly, to a ship stern which reduces the amount of power required to move the water from the front of a forwardly moving ship.

Description of the prior art Conventional ship stems are generally formed with either vertical leading edges or bulbous bows. In operation, vertical Stems tend to push water to the side of the ship and out of the path thereof. Bulbous bow ships provide greater efliciency of operation when the ship is in ballast. In contrast, the ship plow of present invention is intended to provide improved performance in its loaded condition and moves water in the path of the ship upwardly and rearwardly with respect to the stem as such stem passes therethrough.

SUMMARY OF THE INVENTION The present invention is characterized by a ship stern formed between its half loaded waterline and its full loaded waterline with a plow having an upwardly and rearwardly extending taper. Thus, as the ship is propelled through the water, the water in the path thereof will be raised upwardly as it passes rearwardly over the tapered portion to thereby reduce the resistance to said ship moving through the water.

The objects and the advantages of the present invention will become apparent from a consideration of the following detailed description when taken in conjunction with the accompanying drawings.

DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a ship embodying the present invention;

FIG. 2 depicts, in enlarged scale, fragmentary superimposed contours dened by a plurality of horizontal sectional views taken throughout the height of the ship shown in FIG. 1;

FIG. 3 depicts, in enlarged scale fragmentary superimposed contours defined by a plurality of vertical trans- 3,511,203 Patented May l2, 1970 ICC DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG. 1, the ship of present invention includes a hull having a stem A which is formed between its half and full loaded waterlines 5 and 10, respectively, with a plow, generally designated 13, having upwardly and rearwardly tapered surfaces 15 which angle outwardly to opposite sides of the ship hull whereby the water in the path of the ship will be lifted upwardly as the plow passes forwardly therethrough.

The surfaces 15 angles forwardly and downwardly to a rather blunt protuberance 21, which may be in the form of a conventional bulbous bow.

The horizontal lines in FIG. 2 represent verticals, or longitudinal vertical planes spaced at selected distances from the longitudinal center line of the ship. The vertical lines in FIG. 2 represent the stations, or vertical transverse planes, taken at selected distances from the front end of the plow 13. The curves 39 shown in FIG. 2 represent the horizontal contours of the right hand half of the plow 13 from the front end thereof, aft to station 18, such curves being taken along horizontal sections at waterlines 3, 5, 6, 7, 8 and 10. It is noted that the left hand half of the plow 13 is a mirror image of the right hand half.

The horizontal lines in FIG. 3 depict waterlines or horizontal planes through the ship shown in FIG. l and the vertical lines depict verticals, or planes extending vertically throughout the length of the ship and spaced at selected interavls form the longitudinally center line of the ship. Curves 31 in FIG. 3 depict the contours dened by transverse vertical sectional views of the right hand side of the center line of the ship shown in FIG. 1, such sectional views being taken looking forward toward the front of the ship, it being noted that the left hand half is a mirror image thereof. The front end of the protuberance 21 is at station 21 and each of the curves 31 are taken at the indicated stations, back to station 171/2.

The horizonal lines in FIG. 4 represent the waterlines, or horizontal planes through the plow 13. The vertical lines in FIG. 4 represent stations, or transverse vertical planes, through the plow 13, commencing with station 21 at the tip of the protuberance 21 and progressing rearwardly in increments to station 18. The curves 45 shown in FIG. 4 represent the vertical contour at the front end of the right hand half of the ship, such curves being defined by longitudinal vertical sectional views through such ship at verticals 0, 1, 2, 3, 4 and 5. Waterline 10 is the loaded waterline, or depth to which the ship sinks when it is loaded, and it is of particular importance that the plow 13 angles upwardly and rearwardly at approximately 20 degrees from the half loaded waterline number 5 (waterline to which the half loaded ship would sink) to such loaded waterline number 10 to `cause the water passing thereover to be lifted from the path of the forwardly moving ship.

From the foregoing, it will be apparent that when the loaded ship of present invention is under way, the plow 13 will lead the stem A through the water and will serve to pass such water upwardly and rearwardly over the inclined surfaces 15 to be rolled outwardly in much the same manner as the action produced by an agricultural plow share in the process of turning over sod. It has been discovered that the upwardly and outwardly turning of the water in this manner by the plow 13 enhances the operational characteristics of a ship by a substantial percentage over the performance of a conventional stem. As noted above, the stem A may employ a conventional bulbous bow design below Waterline 4 (FIG. 4), but the plow 13 must angle upwardly and rearwardly from approximately half loaded Waterline 5 to full loaded waterline 10.

From the foregoing, it will be apparent that the ship stem of present invention provides substantial reduction in the resistance to forward movement of a ship by the plow shape thereof.

Various modifications and changes may be made with regard to the foregoing detailed description without departing from the spirit of the invention.

I claim:

1. A ship comprising:

a hull including a stem plow formed between the half 4 loaded waterline and the full loaded waterline with a tapered portion that angles upwardly and rearwardly at substantially 20 to the horizontal whereby when the loaded ship is driven thorugh the water 5 said plow will lift the Water upwardly from the path thereof and direct it rearwardly realtive to the tapered portion to be divided into approximately equal portions passing to opposite sides of said hull.

10 References Cited UNITED STATES PATENTS 3,433,194 3/1969 Csupor 114-56 3,443,544 5/1969 Begizov 114-56 ANDREW H. FARRELL, Primary Examiner 

